Metal coated refractory material and process of making the same



Patented May 30, 1933 UNITED STATES HENRY H. HARRIS, OF DETROIT,MICHIGAN METAL COATED REFRACTORY MATERIAL AND PROCESS OF MING THE SAMENo Drawing.

This inventionrelates to refractory lining walls and bricks generallyemployed in heat treating furnaces.

The primary object of this invention is to provide a refractory brickhavin high temperature resistance as 'well as fracture re sistingqualities.

Another object of this invention is to provide a refractory substance orcompound of 1c the above mentioned character which may be formed in sucha manner as to provide an open structure thereby forming a porous masswhich is caused by the oxidatlon of one of the elements in thecomposition.

A still further object of this invention is to provide a refractorylining of the above mentioned character which is inexpensive inconstruction and adapted to resist the chemical action of gases, metalsand slags.

Other objects and advantages of this invention will appear during thecourse of description.

Heretofore it has been common practice to form refractory bricks bymixing silicates with coke and other granular material.

The disadvantages of the above type of refractory bricks are numerous,one of which is the cracking and fracturing most commonly caused, byvariations in the furnace temperature and another cause is the chemicalaction of gases slags and metals thereon. i

The above disadvantages are overcome by the use of a filler such ascarborundum mixed with an alloy metal such as chrome or aluminum alloy.It is well-known in the art that chrome alloys will allow a hightemperature heat above 1700 and certain aluminum alloys range about thesame or a little below.

The metal alloy forms a binder for the refractory material which may bethe conventional clay refractory or carborundum. Carborundum has knownproperties which are well adapted for use in connection with refractorymaterial and for this reason it is well to employ carborundum to obtainthe best results.

In preparing my furnace lining, I prefer to employ carborundum for thefiller as it Application filed May 17,

is manufactured in flake or finely divided form. To the filleris addedfragments of metal alloys such as aluminum or chrome alloy metals whichare also in a finely divided form for facilitating easy and even mixingof the filler and binder.

.After the two elements have been thoroughly commingled, the mass isthen formedv into bricks or the desired shape best adapted for theparticular use which the refractory to 'material is to be employed. Thepressed forms or bricks are then subjected to a high heat causingoxidation of the metal alloys -which forms a porous mass, while themetal alloys are running through the filler. Only particles of the metalalloy are oxidizedas it is impossible for air to reach the most interiorpart of the form or brick.

The oxide formed in this manner has a higher heat resistance than themetal chrome or aluminum alloys and it also further acts as a binder tohold the mass together thereby preventing fracturing of the material.

It is to be understood that I do not wish to limit my disclosure to acarborundum filler or a chrome or aluminum alloy binder, asother alloysmay be substituted with the filler and likewise other refractory fillersmay be substituted with the alloy binder without departing from thespirit of the invention or the scope of the subjoined claims. It is alsoto be understood that this disclos ure is for the purpose of teachingthe gist of my invention and that I do notwish to be restricted to exactproportions.

What I claim ,is: i

1. Process of making a strong refractory product comprising comminglingrefractory filling material such as carborundum in subdivided form withheat resisting alloy materials such as chrome and aluminum alloys alsoin subdivided form, pressing same into tiles or bricks, and applyinghigh heat thereby causing oxidation of the metal and resultant addedbinding together of the particles.

2. A refractory brick or tile comprising a non-metallic refractoryfilling material incorporated with a heat resisting alloy, such aschrome or aluminum alloys, said alloy being at least in part oxidized,and roviding a' porous binder having heat and acture resistingqualities. 1 3. refractory brick or tile comprising a 6 mixture ofsubdivided non-meta11io refractory material, such as carborundum, andsubdivided heat resisting alloyrinaterials, such as chrome or aluminumalIoys,' fused together, the fused mass containing the oxide of thealloy, and providing a porous binder having heat and fracture resistingqualities. In testimony whereof, I have signed my name hereto.

HENRY H. HARRIS.

